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A practical concern is that it's always changing, since it's free for editing by others.
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<p>That's why you use permalinks, duh. :)</p>
<p>There's also this nifty "cite this article" link on the side.</p>
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Finally, it's not a completely reliable source.
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<p>Neither is Encyclopedia Britannica, which has a similar degree of error.</p>
<p>If you picked the global warming article for instance, which is a featured article, we beat EB by a mile in terms of accuracy and depth.</p>
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Second, many articles on Wikipedia are not original or lack citation.
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<p>It depends on what you mean by "not original". First of all, we use the GFDL licence. We're also extremely concerned about copyright. This means we can't simply copy stuff of other pages, and when we find something like that (read: it <em>will</em> be found, often within minutes because we have automatic robots which google subsmissions and check licences) -- we delete them, tag them for copyvios, do the appropriate bureaucratic procedures, etc. </p>
<p>You should also know that plenty of scientists EDIT Wikipedia -- and some are even sysops. Why? These scientists see Wikipedia as a promising channel to educate the public. Do you know why? Because the media generally fails about 90% of the time. (See BBC and their stupid animal communication stories that drives linguists nuts.) </p>
<p>The other thing is that Wikipedia has plenty of mirrors. We don't mind if Wikipedia text is posted elsewhere verbatim, because we're open source. And if we take other material, we do cite it (for intellectual reasons) -- but this of course is a separate issue from copyright. (Remember, copyright is a LEGAL issue, while citation is an intellectual honesty issue!) The other thing is that we demand citation generally not because of wishing to avoid plagiarism, but rather to substantiate assertions (e.g. evidence). Where we take material, you might find we take material from other texts with GFDL licences, open source licences, material released into the public domain, authors who release their stuff into public domain or GFDL for us, texts whose copyright have expired e.g. Encyclopedia Britannica 1911 (and we explicitly stub that at the bottom where we do that, and also we have a tag to try to merge EB 1911 language into our language and also keep the NPOV up to date, since sometimes EB 1911 has that "imperialist Westerncentric" sneer to it.).</p>
<p>The other thing people should know is how Wikipedia works. There's this link on the side called "Recent Changes". At any time of day, hour, minute, second, we have taskforces of people who are on something called RC patrol, who hunt down new submissions, articles, edits and so forth -- especially from "high-suspicion" groups like new users and anonymous users. We also have a way to flag articles as "checked by trusted users". Every time an article is edited by someone outside the "trusted user" pools (generally user veterans, people who participate regularly in the Wikipedia bureaucracy, on top of sysops), articles become unflagged.</p>
<p>You might ask why we don't go the other way and say, keep an edit on hold while it gets "approved". That was the Nupedia model -- the predecessor of Wikipedia. A few dozen articles in a few months. And who watches the watchers? The "watcher" pool will also be very small. Nay, the community polices itself. We also have that other philosophy that also happens to be found at UVA: *For here we are not afraid to follow truth wherever it may lead, nor to tolerate any error so long as reason is left free to combat it. *</p>
<p>Also, there are these things called "discussion pages" and "history pages" you guys. I'm not even getting into the Wikipedia metapages where the heart of the bureaucracy is located. (Have any of you seen the [public] administrator's noticeboard?)</p>
<p>I'm not even talking about those nifty "delete" and "block user" button tools that sysops get yet. </p>